I was wondering if anybody could provide me with any links to some documentation on how to setup the OAI harvesting of documents in Fez/Fedora?

I think I understand that the DC sets are used for harvesting, but I am confused as to how to associate them with the existing MODS fields. I have been working with the Book document type and I cannot seem to get any of the documents to
appear on the oai.php listing. I have had a look through the wiki, but cannot find anything with any clear instructions on how to achieve this.